..it's a well known brand of 3" spring clamp...for twenty bucks in front of the local thrift store. I saw those in the hands of a guy I know to be a "junk shark" who is there every day but not a doityurselfer. He'd paid ten bucks for twenty of them. I offered him twenty bucks as he was clearly not a guy who would use them himself...he was happy to double his money and I've been using them for ten years.